Excellent bending resilience Low moisture absorption High hardness in a moist environment Wear resistance size:300*813255*813205*660165*630162*550128*4802000X5502500X7003000X7503200X7503200x900Inside diameter (ID) avaliable with Φ50,Φ80,Φ100,Φ125,Φ128,Φ162,Φ165,Φ175,Φ185,Φ205,Φ210,Φ255,Φ260,Φ300 If you are interested in other size, please inform me, and i will be glad to send you more information ...